Book/Report

FZJ-2018-06568

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Untersuchung des Verformungsverhaltens von stengelkristallinen und einkristallinen Superlegierungen bei Temperaturen oberhalb von 900 Celsius

Nahrath, S. (Corresponding author)FZJ* ; Penkalla, H.-J.FZJ* ; Schubert, F.FZJ* ; Nickel, H.FZJ*

1994
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/20138

Report No.: Juel-2893

Abstract: This work concerns the microstructure and the anisotropic mechanical behaviour of several, chosen nickel-base superalloys in case of directional solidification. The uni- and multiaxial, mainly strain-rate controlled experiments were run with single crystal and columnar grained, solid, cylindrical specimen (orientation <100>) at temperatures above 900°C. These reality-close testing conditions refer to intended future applications as material for the first row of cooled turbine blades in stationary gas turbines. The changes of the microstructure ($\gamma$'coarsening) due to pure thermal exposure and to thermal and mechanical load were analysed.The relation between axial and/or torsional stationary strain-rate and corresponding stress response was described mathematically. This description is based on a creep-potential, which is modified for anisotropic behaviour using a formalism formulated by HILL. The analysis of stationary strain-rates and measured stresses leads to a creep law, which implicates the microstructure-based unified model of PENKALLA as special case.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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